Letter from Christian Gottfried Ehrenberg, Berlin to Edward Sabine Regarding research on brick dust in reference to work carried out by Sir Henry Rawlinson. [Ehrenberg] suggests making more efforts, for example by stationed officers to collect samples of this dust for more detailed analysis. In particular, Ehrenberg mentions evidence of such dust [meteoric dust] in Shangai [Shanghai] and Ningpo [Ningbo] in China. 7 October 1862